CONTROL DEVICE AND METHOD FOR TRIGGERING PASSENGER PROTECTION DEVICES

• US 20100231401A1
• Filed: 09/30/2008
• Published: 09/16/2010
• Est. Priority Date: 11/28/2007
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Melchert, Jens, Lang, Gunther
• Granted Patent: US 8,648,704 B2
• Time in Patent Office: Days
• US Class Current: 340/669
• CPC Class Codes: B60R 2021/0117 Noise
• CPC Class Codes: B60R 21/013 including means for detecting collisions, impending collisions or roll-over
• CPC Class Codes: B60W 2050/0215 Sensor drifts or sensor failures

Abstract

A method and a control device for triggering passenger protection devices are provided, the passenger protection devices being triggered as a function of a first acceleration signal and/or a driving dynamics signal. The acceleration signal is corrected by an offset by a comparison with the driving dynamics signal.

Claims

1-10. -10. (canceled)

11. A control device for triggering a passenger protection device, comprising:

a first interface adapted to provide at least one first acceleration signal of an airbag acceleration sensor system;

a second interface adapted to provide at least one driving dynamics signal of a driving dynamics system;

an evaluation circuit adapted to trigger the passenger protection device as a function of at least one of the at least one first acceleration signal and the driving dynamics signal; and

an offset correction circuit adapted to correct the at least one first acceleration signal by an offset by a comparison with the driving dynamics signal.

12. The control device as recited in claim 11, further comprising:

a deactivation circuit adapted to deactivate the offset correction circuit as a function of at least one threshold comparison of the at least one first acceleration signal, and maintain a correction value, which was reached prior to the threshold comparison.

13. The control device as recited in claim 11, wherein the driving dynamics signal is at least one second acceleration signal.

14. The control device as recited in claim 13, wherein for the comparison, the offset correction circuit has an element for forming a difference between the at least one first and the at least one second acceleration signal, and a threshold decision element for the difference.

15. The control device as recited in claim 11, wherein the offset correction circuit is configured in such a way that the offset correction circuit integrates the at least one first acceleration signal for the comparison, the driving dynamics signal then being an intrinsic speed of the vehicle.

16. The control device as recited in claim 14, wherein low-pass filtering is provided upstream from the element for forming the difference, which has a time constant that is shorter than a sensor-internal offset regulation.

17. The control device as recited in claim 12, wherein the threshold comparison is performed in such a way that the offset correction circuit is deactivated when the at least one first acceleration signal one of amounts to more than 2 g or amounts to more than a specified noise threshold.

18. A method for triggering a passenger protection device, comprising:

triggering the passenger protection device as a function of at least one of;

i) at least one first acceleration signal, and ii) a driving dynamics signal; and

correcting the at least one first acceleration signal by an offset by a comparison with the driving dynamics signal.

19. The method as recited in claim 18, wherein the comparing includes forming a difference between the at least one first acceleration signal and the at least one second acceleration signal as the driving dynamics signal, and supplying the difference to a threshold decision element.

20. The method as recited in claim 18, further comprising:

deactivating the offset correction if the at least one first acceleration signal lies one of above 2 g or above a specified noise threshold.